The second noble truth is not so easy and clear. Because here you are told that the cause of suffering is your own models, your own expectations, your own ideas, your own assumptions, your own desires, your own wanting things to be only your own way. This is the cause of suffering.
I feel that the second noble truth is extremely important because it is only when you realise it that the third and the fourth noble truths can follow.
One point is that when you see this, you have to take responsibility for what is happening inside yourself. This is not an easy teaching. To have complete self-reliance and to say: I create my own suffering and therefore only I can free myself. This is because there are some easier teachings where you are told: I will help you, you have only to trust or surrender to me and everything will be all right. You do not have to do anything, only have trust, faith, belief and so on. Hence this second noble truth is an extremely radical teaching. It is not an easy teaching.
What is also difficult and subtle is for you to fully realise this truth. Take the example I gave this morning. Someone had stolen from you what you consider as extremely precious, something that is more precious than your own life. And when you were sad and suffering, someone asked you: Why are you sad? Why are you suffering? So you said: That person took my most precious possession. When we are angry and are sometimes asked: Why are you angry? we answer: This person hurt me. He did such and such to me, that is why I am angry.
So you see the second noble truth is something very subtle to realise. When a person’s precious possession has been stolen, he says he feels sad because this man stole it. But can the person respond differently with something other than that reaction? Can he let go of his identification with what he considers as something very precious? If he can do that, then he will realise there is no suffering. So this is a very hard medicine. In fact, some medicines are not very pleasant, and not very sweet. So this medicine that is presented is also not very easy.